Multipole spilldown in the SPEAR 3 dipole magnets

Author

Corbett, J. ; Dell´Orco, D. ; Nosochkov, Y. ; Tanabe, J.

Author_Institution

Linear Accel. Centre, Stanford Univ., CA, USA

Volume

4

fYear

1999

fDate

1999

Firstpage

2355

Abstract

The main SPEAR 3 dipole magnets are 1.45 m long with a pole contour designed to horizontally deflect and vertically focus the electron beam. At the nominal beam energy (3 GeV), the field and gradient along the magnet centerline are 1.3 T and 3.3 T/m (k=-0.33 m ^-2), respectively. Due to the straight core construction, the beam passes through each dipole with up to 16.6 mm trajectory offset relative to the centerline. This paper describes a method used to characterize the spilldown effect from magnetic multipole fields as observed by the beam traversing the dipole magnets. Results of tracking studies utilizing the longitudinal variation of multipole fields are discussed

Keywords

accelerator magnets; electromagnets; electron accelerators; electron beam focusing; storage rings; 1.3 T; 1.45 m; 3 GeV; SPEAR 3 dipole magnets; electron beam; electron storage ring; horizontal deflection; longitudinal variation; magnet centerline; magnetic multipole fields; multipole fields; multipole spilldown; pole contour; straight core construction; tracking studies; trajectory offset; vertical focusing; Apertures; Chemicals; Contracts; Electron beams; Fabrication; Linear accelerators; Magnetic cores; Magnets; Structural beams; Trajectory;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.792689

Filename

792689